Regulation	9 Months Ended
Regulation	Sep. 30, 2025
Investment Company [Abstract]
Regulation	Regulation The Company has elected to be treated for U.S. federal income tax purposes as a RIC under Subchapter M of the Code and intends to comply with the requirements to continue to qualify and maintain its status as a RIC annually. In order to continue to qualify and be subject to tax treatment as a RIC for U.S. federal income tax purposes, among other things, the Company is generally required to timely distribute to its unitholders at least 90.0% of its investment company taxable income, as defined by the Code, for each year. The Company, among other things, intends to make and will continue to make the requisite timely distributions to its unitholders, and as such, the Company will generally be relieved from U.S. federal, state, and local income taxes (excluding excise taxes which may be imposed under the Code). Additionally, as a BDC, the Company must not acquire any assets other than "qualifying assets" (as defined in Section 55(a) of the 1940 Act) unless, at the time the acquisition is made, at least 70.0% of its total assets are qualifying assets (with certain limited exceptions). In addition, the Company must offer to make available to all "eligible portfolio companies" (as defined in the 1940 Act) significant managerial assistance.

New Mountain Guardian IV Income Fund, L.L.C. 10-Q